Edge-setting machine



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F. B, KEALL EDGE SETTING MACHINE Filed July 9, 1920 y 6 Sheets-Sheet 6 Fatented @et 30, 1923 air raras innen FRANK BYCROFT REALI', OF LEICESTER, ENGLAND, ASSIGNOR TO UNITED SHOE MA- i GHINERY CORPORATION, OF PATERSON, NEWT JERSEY, A CORPORATION F NEW JERSEY.

EDGE-SETTING MACHINE.

Application filed July 9,

To all whom t may concern:

Be it known `that I, FRANK BYCROFT KEALL, a subject of the King of England, and residing at Leicester, Leicestershire,

6 England, have invented certain Improvements in Edge-Setting Machines, of which the following Idescription, in connection with the accompanying drawings, is a specification, like reference characters on the draw- 10 ings indicating like parts in the several iigures.

This invention relates to control mechanism, and more especially to automatic'machinery wherein the relative movement of the work and a tool is controlled automatically as Vby hydraulic valve mechanism.

The invention will be disclosed as embodied in the edge setting machine disclosed in United States Letters Patent No. 1,078,684, granted on the application O Keall, Gouldbourn, and Jerram, but is not to be considered as limited in its application to an edge setting machine, or, indeed, to machines foroperating upon boots and 25 shoes, except as so limited in the claims.

Machines of the Vgeneral character to which this invention is peculiarly adapted comprise a tool and a work support arrange-d for relative movement (preferably automatic) to cause the point of operation of the tool to be transferred along the work, and a controlling mechanism which acts during the transfer to control or correct automatically as, for example, by eelers, the relative positions of the tool and work in accordance with changes in .their relations due Ito the progress ofthe operation. The controlling mechanism may comprise gages, eelers, or other contact members7 and in `the machine shown, is operated by feelers bearing directly upon the work, but it may co-operate with any form or contour or pattern surface having a desired deiinite relaf tion to the work. In the machine shown this correcting mechanism comprises' a hy` draulic piston, the movement of which "effects 'the corrective movements desired, and

a main valve controlling the piston, the

main valve being operated through a work or pattern Contact control, and a relay valve 1920. Serial ITc. 394,324.

operated by it. This relay valve mechanism is not claimed herein, being a joint inven` tion or' myself and Arthur Ernest Jerram, and claimed in an application Ser. No. 390,146, iiled June 19, 1920.

lVhen the control means is disengaged from the work, in machines of this type (as is the case when the work i-s ii'nished, and

the tool is retracted in order to remove itV from the machine), the tool and work holder are liable to Vbe moved into abnormal positions. In machines having hydraulic control it is impossible, as a practical matter, to construct the hydraulic control mecha` nism so accurately as to be absolutely free from leakage, the result beingfthat when the machine is standing inoperative, the jack correcting mechanism and the tool head correcting mechanism tend to move into one or the other of their limiting positions. This makes it diiiculft to insert andbegin operation upon a new piece of work. A mechanism for bringingthe tool head to normal position under these circumstances which has been successful is a subject-mat ter ofPatent No. 1,006,484, granted upon the application of 'Keall and Gouldbourn. Prior to the invention of the relay valve con` trol mechanism above mentioned, it was customary to swing the jack into operative po` sition as 'it was being presented to the tool, by a handle which controlled a'normally feeler-operated shaft, and thereby operated the jack correcting mechanism. The. riction in the `massive j ack parts caused a toler` ably smooth response to the action of the handle, but on the application of the feeler actuated relay valve mechanism above mentioned, the sensitiveness became so great thatit was diiiicult tohold the jack in any definite position, and it jumped to andfro.' This caused much trouble, since if the'sole edge face is not normal to the line ofadvance of the ytool head as it approaches the work, one of the eelers which engageaun` derneath the sole will' engage under the sole before the other, and the tool head will be tipped out of proper position.

It is an important object o'l the present-1 invention to insure the return ci the work holder to a predetermined normal relativeV position under such circumstances. rIhre is Vso that movement away from the desired position will move the valve in su-ch a manner as to correct the undesired movement. The

' piston valve may be set to leak a substantial amount in one direction so that the main correcting piston will tend to move to corresponding extreme position with its operated parts. These moving parts, through the cam mechanism, move the valve stem so as to throttle, offset, or equalize the leakage when the parts reach a certain predeterminedl position, and means is provided to move the cam out of controlling position as an incident of the commencement of operation on a work piece.

These and other features of the invention comprising certain combinations and arrangements of parts will be understood from the following description of a preferred embodiment thereof selected for purposes of illustration and shown in the accompanying drawings in which, Y

Fig. l is' a front elevation of the machine Vwith a. part of the frame broken away to show the internal construction.

Fig. 2 is a vplan View of the machine shown in Fig. l with the upper part vremoved.

Fig. 3vis a side view of a portion of the machine shown in Fig. l drawn to a larger scale, with certain parts in section.

Fig. 4 is a vertical section showing in detail the tool carrying head.

Fig. 5 is a plan, partly in section, of the parts shown ini Fig. 4.

Fig. 6 is a front elevation showing certain details of the feeler mechanism.

Figs. 7 8 and 9 show in three positions the valves which control the supply of iuid to the correcting hydraulic cylinders.

Fig. 10 is a perspective of the tool carryingV head, and

Fig. 11 shows the mechanism for bringfing the jack to normal work inserting po-l sition.

Only enough of the machine is, described in detail to enable the invention vto he understood. For a fuller description of parte not'material to the present invention, reference is to Vbe made tof Patent No. 1,07 8,684,

above mentioned. l

In this specification it is to be understood ythat by the path of relative traverse of the tool is meantthat path in which, during the relative motion of the tool and work, the

vtool is in active operation on the work;

and it is contemplated that this path may be shorter than the extent of relative movement of the tool and work, since these meinbers may be so controlled as tomove clear of each other before the relative motion of tool and work has ceased.

The machine comprises a jack or work support upon which the .boot or shoeis securely held and an edge setting tool that has rapid vibratory movements of small amplitude imparted to it to burnish the sole edge of the shoe with which it is maintained in engagement.

The jack comprises a. frame 2 of a lateral-v ly-disposed U shape on the lower arm of which is a dove-tailed slideway 4 that supports an adjustable block 6 for engagingV andV positioning the tread face Vof the sole ofl A U-shaped clamp l2 adapted to embrace,v

the counter portion olf the shoefso as to positio-n it centrally inthe ljack is adjustably mounted in the bend of the frame.

The shoe is held upon the jack by a pend-i ent clamp member 14 carried in the uppei arm of the frame and operated-by the-handle 20 so as to engage the shoe and hold 'it firmly in the jack. A more detailedV description of vthis clamp is not necessary to the disclosure of the prese-nt invention but it will be found, if desired, in Patent No. 1,- 07 8,684, above referred to.

The jack and tool are movedrelatively by automatic mechanism to transfer the lpoint of operation of the tool around the sole edge,

and mechanism, controlled by' feelers bear-l ing upon the sole edge and by feelers bearing upon the tread face ofthe sole near its edge, imparts the relative angular movevments between the shoe and tool that are necessary Vto insure thatlthe acting face of the tool shall bear evenly upon every part of the sole edge vupon which it operates.

The jack 2 is secured uponthe end of a vertical spindle 42 journaled in bearings at a vertical spindle 50 supported in themaizov one end of a frame 44 of which the otherL end isfpivotally carried at 46 (see Fig. 2)' V upon a second frame 48 lthat swings about@v permit horizontal movements of the jack in any direction. Y y A lobed cam 52 fixed to the .lower end. of

the spindle 42 has a cam groove formed in it which engages two rollers 54, 54 which arel supported in a manner hereinafter described. The cam and rollers so guide the jack during its movementtl'iat the sole edge of the shoe on the jack nieves past the tool ina path agreeing approximately in shape with the contour of the sole edge, or in a path' that is the meanof a variety of contours of shoe soles; the relative traverse of the tool and sole edge being brought into exact agreement with the contour of theshoe under operation by the horizontal and vertical movements which are imparted to the jack and tool respectively by the feeler mechanism.

The mechanism for driving the jack 2 comprises a slide 56 that is mounted to reciprocate in guideways 58 and 60 attached to or formed upon the machine frame. The slide56 is coupled Eby a piston red 62 to the piston 64 of a hydraulic. cylinder 66 secured to the machine. Motion is transmitted from the slide 56 to the jack by means of two chains or other similar iiexible members 68 and70. The chain 68 is secured to the slide 56 at one end and after passing around Iulleys 72, 74 and 76 is attached at its other end at 78 to the cam 52; and the chain70 alsosecured to the slide 56, passes around pulleys 80, 82, 84, 86, 88, as shown in Figs. 2 and 3, and is joined to the cam at 90. To increase the motion derived from the slide 56 the .pulleys 74 and 82 are mounted upon 'the slide while the remaining pulleys, except 84, are carried upon the machine frame. The pulley 84 is carried upon a lever 92 pivoted to the machine frame and is actedupon by a spring pressed rod 94 to keep the chains 68 and 70 under the necessary tension. If desired, the chains instead of being attached to the cam 52 may be secured to a pulley of corresponding formation.

By the connections above described, the jack is oscillated from side to side by the reciprocation of the slide 56 and the direction of motion of the slide is reversed automatically by a'mechanism not necessary .to be described here, a full description of which will be found in Patent No. 1,078,684, alreadyv referred to. This mechanism operates the valve 102 that controls the supply of fluid to both sides of the piston 64 in the hydraulic cylinder 66 before mentioned.

' The point of operation of the tool is transferred along the sole edge of the shoe, from the shank on one side of the sole, around the toe portion, to theshank on the other side. ofthe sole; the direction of motion ofv the` jack being reversed when vthe tool reaches the shank.

'The edge setting tool 200 has an acting face 202 to engage the sole edge and is provided `witha lip to engage theunderside tension 212 from a sleeve 214 that is rotatably mounted at 215 in a bearing frame 216 supported by pivots 218 which couple it to two pairs of twin levers 220, 222. The twin levers 220 are pivoted upon a frame lever 224 pivoted at 226 uponl the machine frame. The twin levers 222 are connected to the frame lever 224 by a bell crank 228 pivoted at 230 to the frame lever 224. The other end of the bell crank lever 228 is coupled to a projection from the machine frame by means of an anchor link 232. By this construction the tool holder 206 can be vibrated laterally about the fulcrum 211 of the T- shaped piece 210; the sleeve 214 and tool holder 206 can be angled about the common axis ofthe shank208 and of the sleeve 214; while the sleeve 214, tool holder 206 and bearing frame 216 during their lateral and vertical movements to follow the' sole edge are maintained horizontal by the action of the twin links 220, 222 which, in conjunction with the bell crank 228 and link 232 constitute a parallel motion device.

`The edge setting tool 200 isl vibrated rapidly about the axis of the stem 211 byconnections from a shaft 234. This shaft may be oscillated by any suitable mechanism but preferably by a mechanism of the type described in the specification of UpS. Patent No. 1,035,445, granted Aug. 13,

'1912. This mechanism is indicated at 236,

Fig. 1, and is not herein described as it, in

itself, forms no part of the present invention. The mechanism may be conveniently operated from the pulley 348. The shaft 234 is connected with the tool holder 206 by a universal coupling comprising a sleeve 238 open at the top, as at 239 to admit the member 210, the ends of the sleeve being pivoted .upon the shank 208 outside the member 210,

and a fork 240 that is secured to the shaft 234 and is pivotally connected with the sleeve 238 by a pin 241 disposed at right angles to the shank of the tool holder. The member 238 constitutes the cross-shaped member of the universal joint between the shaft 234 and thestem 211.

, Backward thrust of the tool owing to its pressure upon the work is transmitted to the bearing frame 216 by a thrust rod 242 seated at one end against a set screw 244 screwed into the frame 216, its other end engagingthe bottom of a recess in the shank ofthe tool holder 208, the point of engagement being .located at a point in lthe axis ofthe T-shaped piece 210. v

The tool 200 is pressed against the sole edge of the shoe by means of a spring 246; and by the coi-operation of this spring with the cam 52 on the lower end of the spindle 42 of the jack 2 the point of operation of the tool is caused to-travel along the sole edge during the movement of the jack. But it is necessary during the movement of the jack that there be yangular movement in a horizontal plane between the jack and the Y tool to maintain always the acting face of the tool in pro-per engagement with the' sole edgeat everyv part of the contour thereof. Further, it'isrnecessary also that the jack and tool be-turned relatively about an axis that is-normal to the acting face 202 of the tool owing to the fact that all parts of the sole do not lie in the same plane. These movements of adjustment between the jack and the tool are effected automatically by the correcting devices hereinafter described.

The correcting device for angling the jack in a horizontal plane in relation to the tool comprises a Vhydraulic cylinder 248, the piston lrod of which'is connected by a link to a jack correcting lever-*250 pivoted at 252 to the machine frame. This lever supports the two rollers 54, 54 hereinbefore referred to asfengaging the groove in the cam 52 on the lower end of the jack spindle. The valve 254 of the hydraulic cylinder is controlled by two feelers 256, 258 which, under the action of suitable springs, bear upon the sole edge, onev on each side of the edge setting tool 200. The feeler 256 is coupled to one end of a lever 260 pivoted upon an extension from the' sleeve 214 and the feeler 258 is coupled to la lever 262 also pivoted uponrv the sleeve 214. The lower ends of the levers 260, 262 areconnected by a cross-bar 264 (see Fig, 6) which constitutes one element of' a universal joint connected toI the upper end of a shaft 266 having at its lower end a similar joint with the spindle of the valve 254. The operation of this correcting device is as follows z-VVhen the tool is bear ing evenly upon the sole edge, the valve 254 of the cylinder is maintained closed by Vthe connections between itand the feelers 256, 258. But when the feelers are moved rela-` tively to one another by changes in the contour or general direction of the sole edge vpassing the tool, the levers 260,262 to which the feelers are coupled will likewise be moved relatively, thus angling the cross' bar 264 that joins Vthem andv transmitting umotion'by the shaft 266 to the valve 254.

The valve being thus actu-ated causes the piston of the cylinder 248 to Vbe set in motion so that the jack correcting lever 250` is turned upon its pivot 252. The Vjack 2 being connected to the lever 250 by the rollers 54, 54'and the cam 52 will also VbevThe correcting device that effects aV relative turning movement of jack and tool about an axis that is normal .to the acting face of the tool comprises a hydraulic cylinder 270 the piston of which is connected by a thrust rod 272 with an extension 274 from a collar that is secured to the projection 212 from the sleeve 214.V A spring 276 connects the sleeve 214 and the frame 216 and opposes the'thrust of the rod 272. The valve278 that regulates the admission of fluid to the cylinder 270 `is controlled by two feelers 280, 282 that bear upon the tread face of the sole of the shoe immediately adjacenttothe sole edge. These feelers are formed as springsustained levers pivoted upon extensions from the sleeve 214, the free ends of the levers being coupled by a cross bar 284 connected by a universal coupling and a shaft 286, with the rotary valve. stem of the. cylinder 270. The action of this correcting device is similar to that firstVY mentioned, that is to say, theV feelers l280, 282 being displaced relatively by changes in the co-ntour of the portion of thersole engaged by them, angle the cross bar'284 and turn the valve 278 so that the latter is actuated either to cause the piston of the cylinder 270 to be raised by the admission of fluid or to permit it to be depressed by the action of the spring 276 on the sleeve 214. The sleeve, tool holder and tool are thus turned about the axis of the shank of the latter to restore the sole edge and tool to their original relationship, namely one in which the plane of vibration of the i. tool coincides with that of the part of the sole edge engaged by it.` The angling of the sleeve 214 causes the feelers 280., 282 bearing on the sole to be returned to their normal position, thus again actuating thel valve 278 and stopping the motionof the piston.

It may be here remarked that in order to permit movement of bothA sets of feelers toward and away fromthe valves controlled by them as the feelers followthe traverse of the tool, or as the toolV carrying Vhead is moved bodily toward andfrom the work, the shafts 266 and 286 preferably are made telescopic and with pin and slot connections so that turning movements only are transmitted to the valve. rlhe shaft 234fwhich imparts vibratory movement to the tool is also madetelescopic' 'as shown iii-Fig: 1

llO

toipermit the movements of the tool hereinbefore indicated. *Y

To move the tool into engagement with the sole edge or to remove it therefrom, a starting and stopping lever or controlling lever 290 is'provided which is fixed upon a roclrshaft'292 journaled in the machine frame. The roclrshaftf292 has upon it an armf294rto which is pivotally linked a plunger 296 into which extends a-rod 298-free to turn within a bearing uponthe vframe lever 224. The spring 246, the function of which is to keep the tool pressed against the sole edge while the machine is in operation, surrounds the rod 298 and abuts at its lower end against a collar 300 supported by projections from a nut 302 working on a screwed portion, of the rod 298 and at its upper end against an abutment 304 pivoted on the lever 224. A collar 306 secured to the upper end of the rod 298 operates to limit the movement of the rod in the abutment 304 under the infiuence of the spring 246. By this construction the tool can be moved yieldingly toward the soie edge and removed positively therefrom. Preferably the plunger 296 works in a dash pot 308 which cushions the movement lof the lever 290 and frame lever 224 when the machine is thrown automatically out of action.

A pump 360 is provided which supplies fluid under the requisite pressure to the hydraulic cylinders of the machine and there is an air pressure chamber 362 into which the fluid is nu'mpedbefore passing to the hvdraulic cylinders.

' The valve mechanism for operating the automatic correcting devices is contained in a casing y370. This casing contains both of the mechanisms for angling the jack in a horizontal plane and rocking the tool about a horizontal axis. A description of the former of these mechanisms will suiiice inasmuchv as they are quite similar. The casing 370 contains a cylindrical bore 372 enlarged at its bottom as shown at 374 to provide a shoulder 375 and containing the main pistonv valve 376. This valve is of the balanced or equilibrium type and is reduced as shown at 378, 380, 382, the remaining portions 379, 381. 383` 385 fitting the bore 372 accurately. The lowerend of the piston 376 is chambered as at 384 to accommodate a spring 386, one endof which rests against the piston and thev other end against a disk 388 in the bore 374. The diameter of this disk isY larger than the diameter of the main body of the bore 372 so that itcan vrest against shoulder 375 at the placewhere the bore changes size. Below the dislr is a spring 392 substantially stiffer than the spring 386, one end of which rests ragainst the disk and the other against the bottom of the casing 370. ,A pin 394 is fixed in the piston 376 and serves to guide the v mation.

springs and the disk, and exten-ds outside the casin fo-r a purpose tobe described below. ne side of the casing has two ports 396, 398 from which pipes lead to the ends of the cylinder 248 to operate the piston therein. These ports are spaced to coact with the valve portions 381, 383. The other side ofthe casing has three ports 400, 402, 404. Willen the piston 376 is in the position shown in Fig. 7, oil from the pump 360 enters the port I402, passes around the reduced portion 380 and into the port 396, operating the piston in the cylinder 248. The oil on the other side of the piston in the cylinder exhausts through the port 398 aroundthe reduced portion 382 and out of the port 404 to the pump 360. When the piston 376 is in the position shown in Fig. 9, oil from the pump enters through the port 402, passes around the reduced portion 380 and out of the port 398 to operate the piston in the cylinder 248 in the other direction. The oil on the other side of the piston in thecylinder exhausts through the port 396, passes around the reduced portion 378 and returns to the pump through the port 400. When the main piston is in the posi.. tion shown in Fig. 8, both ports 396 and 398 are closed and the piston in thecontrolling cylinder 248 is held motionless.

The main valve piston 376 is operated by the following described mechanism. The shaft 266 passes into the casing 370 and carries a lug 406 extending laterally from it. A small dog 408 is pivoted at 410 upon the casing 370 in position to be swung by contact of the lug 406 with one side of it. Its other side engages a small-plunger 412 Sliding in a guide in the casing 370. This plunger has a reduced end of peculiar for- The tipv end is conicall as shown at 414. Behind this conical end is a reduced cylindrical portion 416 which is joined to the main body of the plunger by another conical portion 418. The end is arranged to move in and out of a port 420 in the casing which extends between a chamber 422 leading to an outlet pipe 424 and a recess or pressure chamber 426 formed in the top of the cylindrical bore 372.` A very small inlet pipe 428 communicates with thi-s recess, so that the pressure in the chamber depends on the extent of opening ofthe port 420.

Suppose the parts are in the Fig. 7 posi tion and that the feeers which control the shaft 266 are operated in such a way as to move the valve piston 376 from this extreme position. The feelers will turn the stem 266 so as to force the plunger 412 to the right in Fig. 7, thereby reducing the effective area of the aperture 420. .This causes the pressure in the chamber 426 to increase, as the fluid is pumped in through the inlet pipe 428. iVhen the pressure increases sufficiently the piston 376 will move to the right com-v pressing the'V spring 386 until the end of the pistony seats upon the disk'388. At this point the po-rts 396 and 398 (Fig. 8) will be closed, the cylindrical'portion 416 will just be entering the port 420, and 'the control piston in the cylinder 248 will be locked. 1t will not yet have begun any reverse movementybut if it was moving at the time the plunger 412 began to move, its movement in that direct-ion will gradually have stopped. Further movement of the piston 376 cannot occur until the pressure in the chamber 426 lhas increased a 'substantial amount equivalent to the (substantial) difference in the pressures exerted by the springs 386 and 392. The major part of this. increase in pressure will occur after the cylindrical portion 416 of the plunger has passed into-the port 420. The purpose of this cylindrical portion is to necessitate'an appreciable movement of the feelers in raising the pressurein the chamber 426 to the required degree. The pressure having reached the required point, the disk 388 moves back against the spring 392, compressing it until the parts reach the position shown in Fig. 9 at which time the ports at 396 and 398 will have been uncovered and the oil will pass. through them in the direction opposite to that in which it was passing at the beginning of the described cycle, and the correcting movement initiated by the movement of the feelers will take place.

'The behavior of the apparatus is quite similar in moving in the opposite direction. As thepressure in the chamber 426 drops, the piston 376 moves to the left in Fig. 9 until the spring 392 has seated thedisk 388 on the shoulder 375, and the pressure'I is then permitted to drop a. substantial degree after a substantial movement of the plunger 412, f

before the piston begins to move again.

The mechanism described, comprising the two springs and the cylindrical portion of the plunger 416 will thus cause acertain slight sluggishness vin response to the feeler movement, but will entirely prevent hunting inasmuch as a substantial difference in pressure in the chamber 426, which means afs-ubstantial movement of the feelers, is necessary in order to change the control from one phase to the other. The plunger 412 and its operating` parts can be made very small and light in weight since the aperture 420 need not be at all large and therefore the response of the plunger to the reaction between the work and the feelers is practically instantaneous. At the same timethe main valve structure, vcomprising the piston 376 and its related parts. can be made as heavy and rugged as is found necessary, instead of be# ing governed invconstruction by the force exertable b v the feelers which ultimately control it, as would be the case if the feelers operated upon it directly. The force. which operates the main piston 376 is the pressure of springs and the pressure in the chamber 426 and the adjoining part of the bo-re 372 above the piston. This pressure may be varied b-v the additional or subtraetio-nal flow of a small Vquantity of kfluid and this flow may take place' at any desired part of the chamber. fTherefore the.plunger-H412v may be located as vconveniently as desired to the Vfeelers while the main valve pistonm'ay be located'elsewhere in thermaehine where it will be out of the way. The chamber 426, of course,v may be reduced toa small pipe connecting the bore 372 with the aperture 42()7 allthat isnecessary beingl a means of.

mediately'below the loiver'end of the pinv 394. .The end of this arm 434 is supported by one endiof a lever438 pivoted between its ends on a horizontal pivot 440 at one end of a vertically disposed bel-l crank 442 pivoted to the frame of the machine at 444 and the remaining .end of which-is connected by a'third' horizontal' pivotV 446 to one end. of a rod 448 'the opposite end of which is threaded into a nut 450held'jfromendivise movement in the' frame of the mav chine and provided with an enlarged knurled head easily accessible to thev operator. The other end ofthe lever 438 is bent downwardly at 452 and held in contact with the' frame of the machine by a' tension spring 454. r

A projection 45,6 from thelever 438 on wthe same side of its fulcrum as the downv Wardly bent end '452 is in the path of a push rod 458 pivotally connectedy to acrank arm 460 on'the starting shaft 292 to rise as the starting lever finishes its travel in the starting operation and moves the lever 438 t0 allow the arm 434 and its-cam surface 436 to fall. (Fig. 7 thereby releasing the piss ton valve to the control of the relay valve and feelers. l

Movement of the jack in that direction inv which leakage through thevalve system tendsto move the'jack when the tool head is in inoperative position will be accompanied by correspondingmovement vof the jack correcting lever 250. The V.arm 434 will move in company with it and the cam surface 436 is-so formed that whenmoving in such la direction it will act on the pin-394 to move the piston member376 in a. direc# tion to cause movement ofthe jack .in 'the sense opposite to that,V in which leakage tends to move it. Consequently these op- `fusing intluencesestablish a balance determining a definite position ofthe jack not.-

'the frame.

The mechanism above described is entirely automatic, independently of leakage in the pistonvalve, since a position of the ackcorrecting lever 250 other than that tor which the machine is set will cause a movement of the pin 394 in a direction to move the jack correcting lever 250 back to the normal position. It may, however, be sometimes regarded as desirable to set the valve to leak definitely in one direction (and the apparatus will normally wear into this condition irrespective of manufacturing intent), as for example, by making the cylinders 381, 383 slightly conical in the same direction, say, with the apices of the cones to the right in Fig. 8. he piston 376 would then be shifted to the right in Fig. 8, by the dropping of the pin 394- along the cam 436 until the port 398 barely opened as in F ig. 9 so that the tendency to leak would just be balanced.

Having described my invention, what I claim as new and desire to secure by Letters Patent of the United States is l. In a machine of the ola-ss described, a work holder, a tool, means for moving the work holder relatively to the tool to transfer the point of operation of the tool along the work, and means, controlled by an abnormal position of the Work holder after removal of the work, for returning said work holder to a normal position.

2. In a machine of the class described, a wort holder, a tool holder, means for oscillating one of said holders around an axis to transfer the point of operation or' the tool along the work, and means operated by movement of said holder from a normal angular position to replace said holder when the work is removed.

3. In a machine of the class described, an angularly movable work holder, a tool, means for angling the work holt er relatively to the tool to transfer the point of operation of the tool along the work, and means for insuring the return of said work holder to a predetermined normal position after the removal of the work.

4. In a machine of the class described, a work holder, a. tool, means for moving the work holder relatively to the tool to transfer the point of operation of the tool along the work correctingmechanism for correcting the operation of said means to maintain the tool and work in proper operative relation in accordance with the contour of the work, and means arranged to become operative upon the disengagement of the work from the holder to return said work holder to a predetermined normal position.

5. In a machine of' the class described, a w rk holder, a tool, means for moving the holder to carry the point of operation oi' the tool along the work, correcting mechanism for correcting the operation of' said means to maintain the tool and holder in proper operative relation Vall parts of the work,

Vand a cam movable with the work holder out of normal position to causereverse movement of the holder and to restore it toa normal position when the work is removed. 6. In a ii achine of the class described, a work hold-r, a tool holder, operating-means for'relatively moving them to carry the point of operation of the tool along the work, a pattern-contact operated correcting mechanism for differentially correcting` the operation of said means to maintain the holders in proper operative relation at all parts of the work, and means comprising a cam andc'onnections operated by a substantial movement toward an abnormal position to reverse said movement, whereby the holders are maintained substantially in relative operative position.

7. In a machine of the'y class described, a work holder, tool holder, operating means for relatively moving them to 'carry the point of operation of the tool along the work, a correcting mechanism for differentially affecting the operation otsaid means, a hydraulic valve for controlling said correcting mechanism, a leeler mechanism for controlling said valve, said vvalve being constructed and arranged to cause normally a movement of the operating means in one direction, said movement being normally corrected by the feeler mechanism, and means for correcting said movement when the feelermechanism is inoperati-ve.-

8. In a machine of the class described, a work holder, a tool holder, operating means for relatively moving them to carry the point oi operation of the tool along the work, a. correcting mechanism for difierentially aiiecting the operation of said means, a hydraulic valve for controlling said correcting mechanism, and a cam ancL connections between the valve and a holder whereby movement of the holder toward abnormal position operates the valve to correct said movement.

9. In a machine oi 'the class described, a work holder, a tool holder, means for relatively moving themY to carry the point of ope-ration of the tool along the work, said means being constructed and arranged to carry one ot the holders to inoperative 'poition when work and tool are not in contact. and means operated by motion of the holder toward said inoperative position to return said holder to operative'position,

wherebyv said holder is maintained at approximately operative position, said means being automatically thrown out of operation by the starting mechanism of the machine.

10. In a machine of the class described, a work holder, a tool holder, operating means for relatively moving them to carry the point of operation of the tool along the work, a feeler operated correcting mechanism for differentially correcting the operation `of said means to maintain the holders in proper operative relation at all parts oi the work, and means comprising a cam and connections operated by substantial movement toward abnormal position to reverse said movement, whereby the holders are maintained substantially in relative operative position, vsaid connections being automatically broken by the act of starting the machine.

11. In a machine of the class described,

. a work holder, a tool holder, operating means for relatively moving them to carry the point of operation of the tool along` the work, a correcting mechanism for differentially affecting the operation of said means,- a hydraulic valve for controlling said correcting mechanism, a feeler mechanism for controlling said valve, said valve being constructed and arranged to lcause normally a movement of the operating means in-one direction, said movement being normally corrected by the eeler mechanism, and means for correcting said movement when the feeler'mechanism is inoperativesaid means being placed inand o-ut of operation by the movement of the main starting lever to inoperative and operative position, respectively.

12. In a machine of the-class described., a work holder, a tool holder, operating means for relatively moving them to carry the point of operation Vott' the tool along the work, a correcting mechanism for differentially aiiecting the operation of said means, a hydraulic valve for controlling said correcting mechanism, a feeler mechanism for controlling said valve, said valve being constructed and arranged to leak slightly in one direction whereby a holder is moved toward a definite abnormal `position, and a cam and connections between the valve and the holder whereby movement of the holder toward said abnormal position operates the. valve to correct said movement, said cam andconnections being automatically placed in conf trol of the valve by the separation ot the work and tool and placed out of control-bv approaching movement of thework and tool.

18. In a machine of the class described, a

work holder, a tool'holder, operating means for relatively moving them to carry the point oi operation ot the tool along the work, a correcting` mechanism for differentially affecting the operation of said means,

14. In a machine of the class described, a

workv holder, a tool hold-er, operatingmeans for relatively moving them to carry the ,point Aof operation of the tool along the work, a correcting mechanism for differentially affecting the operationV of said means, a hydraulic valvefor controlling said correcting mechanism, a feeler mechanism for controlling said valve, and a supplemental control mechanism connected to a movable element of thev correcting mechanismv for operatingV the valve inthe -absence of eeler control. y

15. In a machine of the class described,a work holder, a toolY holder, operating means for relatively moving them to carry the point of operation of the tool along the work, a correcting mechanism for diiierentially affecting the operation of said means, a hydraulic valve tor controlling said correcting mechanism, a feeler mechanism for controlling said valve, a cam -and 'connections between a movable element of the correcting mechanism and the valve for operating the valve in the absence of the eeler control, and means :tor rendering th-e cam inoperative as an incident et the commencement of operation on a work piece.

16. A machine of the class described having, in combination, an operatingV tool, means for guiding the relative-movement of the tool and work, and correcting means including a feeler'constructed and arranged continuously to engage apattern surface, and means controlled thereby to maintain the tool in a predetermined angular relationship tothe work, said last-named means being constructed and arranged, when the teeler is out of engagement withthe pattern surface, to effect Va relative movement ,of tool and work toward an extreme posit-ion, and a cam and connections, operated by said relative movement, to bring the tool and work back to a selected mean position, the connections providing Jfor adjustment, whereby the selected position may be varied.

17. A machine of the class described having, in combination, an operating tool, means for guiding the relative movement or' the tool and work, Vand correcting means iiicluding a feeler constructed and arranged continuously to engage a pattern surface, and means controlledthereby to maintain the tool in a predetermined angular relationship to the work, and a cam and connections, operated by abnormal relative movement between work and tool When the feeler is out of engagement With the pattern surface, to bring the tool and Work back to an arbitrarily `predeterminable mean position.

18. A machine of the class described, comprising means for sustaining the Work and an operating tool, relatively movable to carry the point of operation progressively along the Work, guiding means acting normally to determine the successive relative positions of said sustaining means and tool in combination with additional'means controlled" by the Work for correcting or varying theefect of said guiding means, said additional means being constructed and arranged normally to move the guiding means to an abnormal position, said normal action being normally inhibited by the said Work control, and a mechanism connecting the guiding means and the additional means to move the guiding means to a definite mean position When the Work control is inoperative, said mechanism being adjustable tovary the definite position at Will. Y

19. A machine of the class described, comprising means for sustaining the Work and an operating tool, relatively movable to carry the point ofoperation progressively along the Work, guiding means acting normallyto determine the successive relative positions of said sustaining means andtool in combination with additional means controlled by the work for correcting or varying the effect of said guiding means, said additional means being constructed and arranged p normally to move the guiding means to an eXtreme position, said normal action being' normally inhibited by the said Work control, yand a mechanism comprising a cam and connections connecting the guiding means and the additional means to move the guiding means to' a mean position When the Work control is inoperative.

20. A machine of the class described, comprising avworlr support, an operatingv tool, means for moving said support and tool automatically with relation to each other, guiding means acting normally to determine approximately-the relative position of said support and tool according to a desired contour of the Work, in combination with correcting means engaging said contour for correcting or varying the operation of said guiding means, said correcting means being constructed and arranged normally to move the guiding means to an extreme position, said normal action being normally inhibited by the said Work control, and a mechanism connecting the guiding means and the correcting means to move the guiding means .to a mean position when the Work control is inoperative, I f

21. A machine of the class described having, in combination, a tool, a Work support, means for producing relative movement of said tool and support to transfer the point ot' operatio-n of the tool along the Work, and correcting mechanismV acting through said means to correct the angular relation of the tool and the Work, said mechanismincluding aV feeler engaging the Work, and connections through vvhich the mechanism is rendered yactive by'variations in the posit-ion of the feeler as its point of engagement is transferred along the Work, said correcting mechanism being constructed and arranged normally to vary the said angular relation to an extreme position upon cessation of the engagement between the feeler and the Work, and a secondary correcting mechanism operated by movement toward said extreme position, for reversing such movement whereby said correcting mechanism` is held balanced in the absence of the said feeler control. v

22. A machine in which a tool is caused to ope-rate progressively along Vthe Work, comprising means constructed and arranged to constrain the tool and Work to assume successively predetermined relative positions, in combination with Work controlled mechanism which may be rendered active automatically to correct o-r vary the operation of said means, said Work controlled mechanism comprising a hydraulic valve, and means independent of said Work control for actuating the valve to balance leakage when the Worklcontrol is inoperative. i

23. In a machine of the class described, a Work support, a tool constructed and.` arranged to operate upon the sole of a shoe, means including a feeler engaging a contour of the sole and hydraulically actuated mechanism controlled thereby for determining the relative position of sole and tool, said hydraulically actuated mechanism being constructed and arranged normally to determine an extreme relative position of the sole and to-ol when the feeler is not inoperativeposition, and means comprising a valve Aand an actuating member therefor actuated kby movement'tovvard said, extreme position to return the hydraulically actuated mechanism to a delinite mean position.

24. A machine in which a tool is caused to operate upon Work along a deinite contour, having, in-combination, a -vvork support and an operating tool relatively movable, a guide, said support and guide being provided one With a cam groove and the other with guiding mechanism co-acting With the groove, and means for swinging the guide to maintain-the desired relation between Work and tool as the point ofoperationis transferredalongthe Work,said means bein provided with a hydraulic valve to contrgl the ,fgudie the guide and valve being 'llO provided one with a cam and theV other with a' follower whereby movement `to an extreme position is automatically corrected.

A machine of the classdescribed, comprising` a tool for operating progressively alongwork, power actuated means for i moving the worltwith relationto the tool, and controllingrmeans therefor comprising means constructed and arrangedy to moveV the controlling Vmeans tou a predetermined position, whereby .thev power oper ated means is maintainedat a corresponding..predetermined position. Y '1 26. In a machineof the classdescribed, a

work support and anop'erating tool rela tively movable in a plurality of directions,

means for. controlling the relative position of work and tool coinprisinga hydraulic cylinder and a piston therein, operative connections between the piston and the work support or tool, a valvev controlling the movement of Athe'- `piston, and Yapair of feelersconstructed and' arranged to be movedV with relation to@ each other through the varying contour of av pattern surface and thereby. to shiftthe valve and correct the relative position of tool and work, and a its member actuated by said piston movement and controlling said valve to return the piston and equalize leakage in the valve when notl'controlled the feelers, when a definite arbitrarily predeterminable `position has been reached by the piston.

27. A machine in which .a

ltool Yis caused to operate 'progressively along` 'the work,

comprising means constructed and l arranged jto constrain the tool yand ywork to assume successivelyl predetermined "relative positions,- in combinationnwith/ pattern con-V trolled 'mechanismwhich n'i'ay be rendered 'active' automatically tofcorrect or vary the operation of said ii'ieans, said vmeha'nisIn be? 'ing 'constructed and arranged "to overcorrect constantly in vthe same V"direcition, 'and aI sec# ondary '-'co'r'recting' 'ri'echani'sin'Y constructed and V arr'anfged to opp'ose Said' Voverc'orreoting movement 'and :to Vreverse and balance it at a predetermined point. y 2s; A 'machine Yf the dass described.

comprisingin combination, j z tck,u 4a -tool Vconstructed 'and arranged to operate z"upfoii l a shoe', means, including fetter,- engaging@ conto ur VVof 'the Ysole o f the 'Shoe''and fluid pressure-actuated mecha'nisn controlled i sad'means fr'lteternnng the relative -p'o'- against the directioninwhich correction is sitio'n: of shoe and tool, said mechanism con# structed and arrangedgto. require constant correction in 'one direction,` and a member .actuated by movement of'one of thefshoeYV or tool to furnisha correction, when the feeler l is inoperative to supply it, the magnitude of correction'being anrin'creasing function of' the movement vof thev said' mechanism i"eqi'ired,"-wliereby the niechanismpwill be arrested at a deiinite predetermined point.

29. in a machine of the-classdescribed, a 'shoej'ack and a tool, automatic mechanism -for transferring the point of operationbf the tool over the shoe, a' correctingniechzv Anflsm for diiferentially vaffectingrthe opcraf tion f'of the `automatic mechanism to Ymain- -tain properoperativerelation, comprising a pattern surfacefhaving` a vdefinite relation toY vthe path of the tool overthe work, a feeler cooperating with said pattern surface, a

feelerysaid valve being,` constructed and arrangedV to 'leak yin* one direction, whereby `constant correction is required byv said; feeler, and an auxiliary correcting mecha'- nism comprisingacam and connections operated Vby relative movement of the work and tool in obedience to said `leakage to *move lthe 'valve ina 'direction to increasingly `offset the leakage as Vthe correcting .mecha nism'v moves i through a predetermined"V mean position whereby the correcting'mechanism isYA balanced in Vthat position( '30. 'In a machine ofthe class described, a 'shoe j acltand a tool, automatic mechanism fortransferringthe pointcf operation of the tool over theshoe, a correcting *mecha Yn ism for Vdifferentially; afecting' the operation yof tl'ie'automatic, mechanism to maintain proper operativerelation, comprising` a pattern surface having'a definite relation to the path of the too-l over the worln'a feeler l Icooperating[withsaid pattern surface, a hydraulic 'control'- valve operated by said vmove the jack, one of the member and valve being provided with a cam and the other with a cam follower, wherebyfmovementof ii the member from a normal position will op; eratelthe valve to correct 'the movement andY rdetermine aI normal positionA for the jack, f

mechanism between the member and Vthe valve to 'vary'the S'aidfnormal position vinde-1 Y:1120 l pendenti-ly Iof the automatic operation of the machine.VA I v Y '31." ln an'iachine of the class described, a shoe jack-'and a tool, automatic"mechanism for transferring the'pointof operation of the tool over theshoe, a-correcting mecha'- there being provision for adjustment'in'v'the Y nisi'n forfdi'tferentially afectingthe Vopera- Y pattern surfafhaving a, densita relaties to -'tionfof the *automatic mechanlSmto m'aillfVH Y tain proper operativerelation, comprising aV r Y v1324) '5110 if vfeelfer, a'member controlled bythevalveto the path of the tool over the work, a feeler co-operatinp` with said pattern surface, a hydraulic control valve operated by said feeler, a member controlled by the valve to move the jack, one of the member and valve being provided with a cam and the other with a cam follower, whereby movement of the member from a normal position will operate the valve to correct the movement and determine a normal position for the jack, the cam and follower being relatively adjustable to vary the position assumed by the member at the instant of balance.

32. ln a machine of the class described, a shoe jack and a tool, automatic mechanism for transferring the point of operation of the tool over the shoe, a correctingmechanism for differentially affecting the operar tion of the automatic mechanism to maintain proper operative relation, comprising a pattern surface having a definite relation to the path of the tool over the work, a feeler (3o-operating with said pattern surface, a

. hydraulic control valve operated by said feeler, a member controlled by the valve to move the jack, one of the member and valve being provided with a cam and the other with a cam follower, whereby movement of the member from ka normal position will operate the valve to correct the movement and determine a normal position for the jack, one of the cam and follower having a pivotal mounting, a lever supporting said pivotally mounted part at one side of its ful- Ell crum, another part of the lever lbeing engageable by the Starting mechanism of the machine to withdraw the lever support from the said pivotally mounted part when the machine is started.

33. In a machine of the class described, a shoe jack and a tool, automatic mechanism for transferring the point of operation of the tool over the shoe, a correcting mecha nism for differentially affecting the operation of the automatic mechanism to maintain proper operative relation, comprising a pattern surface having a definite relation to the path of the tool over the work, a feeler co-operating with said pattern surface, a hydraulic control valve operated by said feeler, a member controlled by the valve to move the jack, one of the member and valve being provided withy a cam and the other with a cam follower, whereby movement of the member from a normal position will operate the valve to correct the movement and determine a normal position for the jack, one of the cam and follower having a pivotal mounting, a lever supporting at one of its ends said pivotally mounted part, and another end of the lever being supported on the machine frame, and the fulcrum being adjustably mounted on the machine frame whereby the normal position defined by the corrective mechanism can be adjusted.

In testimony whereof I have Signed my name to this specification.

FRANK BYCROFT KEALL. 

